Electrical sparking device.



` Nu. 703,759. Patented AJuly |902. f Y

`A. C. BROWN.-

ELECTRICAL SPABKIN-G DEVICE.

(Application led Dec. 21, 1901.) (No Model.)

AilNrrlan .STATES @Fc/EQ ALFRED CHARLES BROWN, OF` LONDON, ENGLAND.A

`ELECTRICAL, SPARKING DEVICE. L

SPEGFICATION forming part of Letters Patent No. 703,759, dated uly 1, 1902. v

i Application tiled December 21, 1901. Serial Nol` 86,768. (No model.)

To all whom, t may concern:

Be it known that I, ALFRED CHARLES BROWN, a subject of the King of Great Britain, and a resident of London, England, have invented certain new and useful Electrical Sparking Devices, of which the followingis a specification. a f

This invention relates to the'class of firing devices wherein an induction-coil or its'equivalent isused to produce a spark for iiring chargesin internal-combustion. engines and for similar purposes on the'interruption or variation of a current passed through its primary or low-tension circuit. Y v

The invention consists inthe combination, with a sparkingplug, ofa condenser whose plates or armatures are y,of tubular orcylindrical form, one of saidy ,tubesv being an extension of the body of the plug,while the otheris contained within the -iirst and is in immediate metallic connection' with the elec-.

trode in the sparking-plug, so as to produce oscillatory discharges across the spark-gap and provide that the current generated by the induction-coil shall be slightly stored by this condenser and sent in larger quantities across the spark-gap, thereby producing a Amuch fatter7 and more flaming spark.

G is a tube, of insulating material, iitted or slipped inside of F, and I-I is another metallic tube fitted or slipped inside of Gandhaving, preferably, a metallic spring-nip I, stamped out of a portion of its side to bear on the cen tral conducting-rod of the plug, as shown, or

, provided with other means for connecting'tlie inner tube H to the opposite side of the sparkgap and high-tension-producing circuit to that to which F is joined, so that F andl H form they two plates or armatures of the'condenser. f-

J is an insulating-cap which maybe slipped onto the tube F and have a smaller hole to grip or fit onto the outside of the insulation of the connecting-Wire to keep out wet.

If the central conducting-rod of the spark* Aing-plug be made large enough, it may itself form or take the place of the tube I-I, andthe ordinary porcelain of the plug may take the place ot' the tube G; but this method of construction involves unduly increasing the size of the plug and is detrimentaliu many re' spects. The capacityof the condenser, however formed, should be approximately lproportioned to the sizeand character of coil, amount of; current, and maximum rate of make and break used and for best effect should be adj usted thereto; but if made of the shape and size shown with ebon'ite, vulcanized liber,

or slightly-stouter lnica 'insulation it will be i found to be efficient. By thus placing the two sides ofthe condenser` in immediate mechanical and electrical union With the'twor sides or poles of the sparking-plug the conductors or connections from both plates of j camv or similar timing contact device, which is driven by gearing from the engine-shaft or otherwise in correct phase for firing, as well understood in the art.

Having now particularly described and as# certained the nature of my said inventionand in; what manner the same is to be performed,

I declare that what I claim is#- l. The combination with a sparking-plug having a metallic kbody through which one of the'electrodes passes, of a tubular condenser comprising two metallic tubes one ofwhich is in immediate metallic union with the body of the plug While the other is contained within the first and is indirect connection with ICO the Wire or conductor terminatingin'the other electrodes of the device.

2. The combinationwith a sparking device for an internal-combustion enginefcompris# ing a metallic plug, an electrode connected therewith, and a' second electrode passing through the ]g lug..lout,insulated'therefi-OIH, of

a condenser, the capacity plates of which consist of two tubes insulated'from one another one of which is connected with the plug and ,has its axis substantiallycoincident with the axis thereof, Whilev the other is metallictlly `connected with4 the conductor which termi# nales in thel opposite electrode of the plug.

3. The combinationwith at.sparking-plug, 15, w 'of a condenser Whose two opposite plates are` both in immediatedirectancl `un'i-nterruptel electricalv connection with the two lopposite 1 v 'l sidesor poles of lsaid.plugrespetatively, as and forfthe purpose'set forth.- .v i v 1 Signed zLtLondon, in the county of London,

1901.. p p y ALFRED CHARLESy BROWN.` 1

Witnesses:l Y v, 'o f H. 1D. JAMESON, f l 2 A. NUTTING.

nim.

England, this Qphjday. of November, A. 13.( u. 

